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P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Related Experiment Video

Updated: Jun 14, 2026

Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices

Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices

Published on: July 8, 2016

Degradation Pathway Tailoring through Nanocrystal Interface Engineering for Photostable Perovskite Solar Cells.

Huichao Guo¹, Fangzhou Liu¹, Cuncun Wu¹

¹Key Laboratory of Materials Laminating Fabrication and Interface Control Technology of Tianjin, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.

|May 27, 2025

Summary

This study enhances perovskite solar cell stability using Cs2PbI2Cl2 nanocrystals (CPIC-NCs) to control degradation pathways. CPIC-NCs modification boosts efficiency to 24.28% and maintains performance under harsh conditions.

Keywords:

degradation pathways interface engineering perovskite nanocrystals photovoltaic performance

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Last Updated: Jun 14, 2026

Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices

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Published on: July 8, 2016

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

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Published on: February 27, 2017

Flash Infrared Annealing for Perovskite Solar Cell Processing

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Area of Science:

Materials Science
Renewable Energy
Nanotechnology

Background:

Organic-inorganic hybrid perovskites (ABX3) show great photovoltaic potential but suffer from instability due to ion migration and light-induced degradation.
Defect-mediated ion migration and decomposition into lead iodide are key challenges limiting perovskite solar cell operational stability.

Purpose of the Study:

To investigate the use of Cs2PbI2Cl2 nanocrystals (CPIC-NCs) and CsPbCl3 nanocrystals (CPC-NCs) for modifying perovskite interfaces.
To explore how nanocrystal modification alters degradation pathways and improves the stability of perovskite solar cells.

Main Methods:

Interface modification of perovskite light-absorbing layers using CPIC-NCs and CPC-NCs.
Analysis of degradation pathways under light exposure, focusing on Pb(OH)I formation and lead iodide decomposition.
Fabrication and testing of solar cells with CPIC-NCs modified interfaces.

Main Results:

CPIC-NCs demonstrated superior performance as interface modifiers compared to CPC-NCs.
CPIC-NCs facilitated controllable Pb(OH)I formation and suppressed perovskite decomposition into lead iodide.
Achieved a champion power conversion efficiency of 24.28% for CPIC-NCs modified solar cells.
Unencapsulated devices retained over 90% of initial efficiency after 600 h (ISOS-L-1I) and 4500 h (ISOS-D-1).

Conclusions:

Nanocrystal-mediated interface control is an effective dual-strategy for regulating defects and degradation in perovskite optoelectronics.
CPIC-NCs offer a promising approach to enhance the operational stability and efficiency of perovskite solar cells.